RARE: 4″ Anacleoniceras Fossil Ammonite | Albian Cretaceous | Madagascar | Certified Authentic Specimen

Description

This is a RARE 4″ Anacleoniceras Fossil Ammonite, an elegantly preserved specimen from the Albian Stage of the Lower Cretaceous, collected in Madagascar.

Anacleoniceras is a genus of moderately involute ammonites known for its gracefully ribbed, discoidal shell and distinctive keel. This particular example displays exceptional shell preservation, with clear suture patterns and morphological features that help define the genus.

All of our Fossils are 100% Genuine Specimens & come with a Certificate of Authenticity.

The photo shows the actual specimen you will receive, with a 1cm scale cube for precise size reference. Please see the photo for full sizing.

 

Geological and Taxonomic Information:

• Species: Anacleoniceras sp.
• Fossil Type: Ammonite (extinct marine cephalopod)
• Age: Lower Cretaceous, Albian Stage (~113 to 100.5 million years ago)
• Locality: Madagascar
• Formation: Possibly Mahajanga Basin marine sediments
• Depositional Environment: Shallow marine shelf to basin margin with carbonate-rich muds and silts
• Geological Stage: Albian

 

Taxonomic Classification:

• Order: Ammonitida
• Superfamily: Acanthoceratoidea
• Family: Possibly Desmoceratidae or related group (identification varies among taxonomists)
• Genus: Anacleoniceras
• Described By: Exact species-level taxonomy under review; genus attributed to Collignon, mid-20th century

 

Morphology & Notable Features:

• Moderately involute shell with pronounced ribbing
• Whorls gently rounded, with strong radial ribs extending from umbilicus to venter
• Typically has a small to moderate umbilicus
• Suture lines gently sinuous, as is typical of mid-Cretaceous forms
• Displays an elegant shell profile and is a highly aesthetic display fossil

 

Scientific & Collector Significance:

Specimens of Anacleoniceras are sought after both for their beauty and their stratigraphic value. They are useful index fossils for the mid-Cretaceous and help correlate sedimentary deposits across the Tethys realm, particularly in Gondwanan continental fragments like Madagascar.

This specimen is a rare and scientifically intriguing example of the genus and is ideal for collectors interested in the diversity of mid-Cretaceous ammonite faunas.

 

Specimen Details:

• Approximate Size: 4 inches – see photo with 1cm scale cube
• Condition: Fully prepared and suitable for display
• Locality: Madagascar
• Includes: Certificate of Authenticity

 

Ideal For:

• Collectors of rare and aesthetic ammonite fossils
• Cretaceous and Madagascan paleontology enthusiasts
• Museum or classroom display
• Gifts for fossil lovers and science-minded individuals